Evaporator and loop heat pipe

An evaporator incorporated into a transportation machine whose allowable tilt angle is α° to evaporate at least a part of a working fluid by heat absorbed from a heat source, comprising:

• a housing having a plurality of surfaces including a front surface and a back surface, at least one of the front and back surfaces having the largest area among the plurality of surfaces;
• and
• a heat-absorbing element disposed on at least one of the front and back surfaces and thermally connected to the heat source, wherein
• the housing includes:
• at least one working fluid inlet located in a surface of the housing, the surface being other than a top surface of the housing;
• and at least one working fluid outlet located in the top surface, and
• when, in the housing placed on a horizontal surface and viewed from the front surface, an intersection between a horizontal plane passing through an upper end of the heat-absorbing element and a vertical line passing through a center of the top surface of the housing is defined as a reference point, a straight line drawn from a central point of an opening of the working fluid outlet to the reference point forms an angle of α° to 90° with the horizontal plane.